RFR: CODETOOLS-7903334: Clean the rest of the ASM dependencies

Mon Sep 26 23:50:46 UTC 2022

This fix contains two changes:
 * Completed refactoring from int access code to Modifiers interface
 * Split instrumentation plugin in two parts: ASM-dependent  and -independent

Next step is to define a generic instrumentation interface and use it to wrap all calls into *.instrument.asm package.

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Commit messages:
 - CODETOOLS-7903334: Clean the rest of the ASM dependencies

Changes: https://git.openjdk.org/jcov/pull/28/files
 Webrev: https://webrevs.openjdk.org/?repo=jcov&pr=28&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903334
  Stats: 601 lines in 20 files changed: 270 ins; 252 del; 79 mod
  Patch: https://git.openjdk.org/jcov/pull/28.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/28/head:pull/28

PR: https://git.openjdk.org/jcov/pull/28